Loop-takers for sewing machines



Sept. 6, 1955 F. PARRY LOOP-TAKERS FOR SEWING MACHINES Filed July 27, 1953 INVENTOR. Frank Pu rry WITNESS ATTORNEY United States Patent 0 This invention relates to lock-stitch sewing machines .and more'particul-arly-to'animproved circularly moving loop-taker especially adapted -"for .use with lock-stitch sewing machines.

Look-takers, ofthe type referred to herein,-have been used .for many years, and generally comprise a cupshaped body secured to the end of a rotary shaft, a thread-case carrier, a-"thread-case, and a-bobbin or other formof-thread'carrier housed in-the thread-case. The "thread-case carrier which is receive'din the cup-shaped body, is restrained from rotating with .the-cup-shape'd body by means of a restraining fingeror other member fixed to the bed of the sewing machine. In-order to accommodate the-relative rotary movementbetween the cup-shaped body and the =thread-case carrier, the inner surface of' the cylindrical side-wall'of the cup-shaped body is provided with-a circular raceway andthe outer ecylin'dricalsurface of the=thread-case car'rier'is formed "wi-t h a peripheral bearing rib which is received inethe above mentioned-raceway. (See P-atent No. 2,101,320, December'7, 1937;) 'In the pastit h'asbeen customary =to-form the circularraceway by a grinding operation which removes a portion of the cup-shaped body-sidewall and leaves ,a portion of the same wall overhanging the raceway, thus *forming'a *g'i'b 'integral withthe cupshaped body and designe'dato .retain the aforementioned ;per ipheral .bearing rib in the raceway. Specifically, this gri-ndingtoperation has required the use! of a.-small extremely .thin Carborundum discwhich. has totbet-moved flatwise in order to grind the circular raceway and leave an overhanging gib. In order that the parts may function properly, this operation of grinding the recessed raceway below the overhanging gib had to be done with considerable care and accuracy and thus was a difficult and expensive operation. Therefore, one of the objects of the present invention is the provision of an improved loop-taker of the type herein considered which can be manufactured without the need for grinding a recessed raceway.

Another object of the invention is to provide a looptaker having an improved removable gib.

Other important objects of the invention will be apparent from the following detailed description and appended claims and a preferred embodiment of the invention is illustrated in the accompanying drawing, wherein:

Fig. l is a plan view of a complete loop-taker embodying the present invention,

Fig. 2 is a plan view of the cup-shaped body which forms a part of the loop-taker shown in Fig. 1,

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2,

Fig. 4 is a view similar to Fig. 2, but showing the gib removed from the cup-shaped body, and

Fig. 5 is a perspective view of the removable gib and holding screws.

Referring to the drawing, the invention has been shown in Figs. 1 through 5, as embodied in a loop- 2,716,955 Patented Sept. 6, 1955 =.taker adapted for use with a lock-stitch sewing Inflchine and .comprising a cup-shaped body 11, .a threadcase carrier 1'12 .and a thread-case 13; it being understood that a bobbin or other formlof thread supplytnot shown) is housed" in the thread-case.

sThe cup-shaped :body 11 has .a .cylindtical hub 14 which, by means .of screws (not shown) carried in :threaded holes 16%16, is secured to the terminal of :a arotary .shaft (not shown). thasa bottom 'wall consisting of a pair of radial arms The cup-shaped body 11 *1717=extending"from one end of thehub 1-4thereby supporting a cylindrical side-wall .18 having --a num- 'ber of well-known elements such as anintegral loop- -seizing beak 19 and a circularraceway22, the raceway having .a base 23 and -a side-wall "24. A separately formed substantially semicylindr-ical needle-guard 26 is heldi'to the side of'the.;cylindrical=side-wall18i:-bymeans of apair of screws '28 28,an'da separately' formed eurved gib 29 vis secured to the end of :the circular body side-wall 18 by means of screws til-+31. The free end of the gib 29'is pointed and formsthe usual loop-controlling tail '32 of theloop-taker. A peripheral bearingrib 33 ofthe -type=shown in *PatentNo. '2,101,320 is :tormed on the outer cylindrical surface of thethread-casecarrier 12and this rib '33 is -jour- -naled inthe previously mentioned raceway 22, the gib .29 anda hereinafter described gib 34 acting to hold the bearing rib 33 in the raceway 22. In accordance with well-known practice, the thread-case carrier '12 and threaid case 1 3 areheld stationary during the sewing operation-by means of a finger 36 formed on the thread-case carrier 12 and this :finger-engages asta- ='The gib "34 is fiat and substantially crescent shaped and is manufactured as -a separate element having an -=overhan'ging semicircular -'flange-,43, a pair of convergent --or beveled ends .44 and 46, and tan outer semicyl-indrical surface 47, which surface is curved and slanted'to coincide-with the shape .of an-externalsurface 48 of 'gz-the oylindrical sidewall 18. Afterjthe cup-shaped body 11 is completely manufactured, the I gib is inserted into a substantially crescent shaped circumferential slot 49 appropriately formed in the circular body side-wall 18 at a location adjacent the part, viz. the beak 19, of the loop-taker which is first to enter the thread-loop, the slot 49 having convergent side-walls which correspond to the ends 44-46 of the gib 34. Since the ends 44-46 of the gib 34 converge as they approach the outer circular surface 47 it will be understood that the gib 34 is inserted into the slot 49 from inside the cupshaped body 11. The gib 34 is secured in the slot 49 by means of a pair of screws 51-51 which enter the side-wall 18 from its lower surface 52 and pass upwardly through holes 5353 formed in the wall 18, and extending parallel to the axis of the hub 14. The uppermost ends of the screws 51-51 enter threaded holes 54 and 54 provided in the gib 34. When the gib 34 is held in the slot 49 by the screws 51-51, the flange 43 is in a position to overhang a portion of the race-' way 22 and thus functions to retain the rib 33 of the thread-case carrier in the raceway 22 in the same manner as the integral gib shown in Patent No. 2,101,320 holds the rib in the raceway.

Since the cup-shaped body 11 is manufactured before the gib 34 is in place, the base 23 and the sidewall 24 of the raceway 22 can' be machined by a comparatively simple operation without any interference from an overhanging gib as would be the case if a looptaker of the type shown in Patent No. 2,101,320, supra,

were being manufactured. In fact, the circular raceway of the herein described loop-taker can be formed by the use of a comparatively large grinding tool that can be lowered directly upon the base 23 and easily moved against the sidewall 24 of the raceway 22.

Having thus set forth the nature of the invention, what I claim herein is:

l. A circularly moving loop-taker for lock-stitch sewing machines, comprising a thread-case carrier having a peripheral bearing rib; a cup-shaped body adapted to receive said thread-case carrier; a side-wall formed as part of said cup-shaped body and having an inner surface with a circular raceway, said side-wall having an overhanging portion forming with said body an openended slot, said side-wall also having a circumferential slot extending radially therethrough, a first gib having one end entering said open-ended slot, a second gib of a size such as to fit into said circumferential slot in said side-wall; a flange formed on the edge of said second gib and overhanging a portion of said circular .r

raceway to confine the bearing rib of said thread'case carrier in said raceway; and means for holding said second gib in said slot.

2. A circularly moving loop-taker for use with lockstitch sewing machines, comprising a thread-case carrier having a peripheral bearing rib; a cup-shaped body adapted to receive said thread-case carrier; a cylindrical side-wall formed as part of said cup-shaped body, said side-wall being provided on its inner surface with a circular raceway, said side-wall having an overhanging portion forming with said body an open-ended slot, said side wall also having a circumferential slot extending radially therethrough, a first gib having one end entering said open-ended slot, and a hole opening into said circumferential slot; a second gib of a size such as to fit into said circumferential slot in said bodywall, and said second gib having a threaded hole; a flange formed on said second gib and overhanging a portion of said circular raceway when said second gib is in said circumferential slot and thus acting to hold the bearing rib of said bobbin-case in said raceway; and a threaded screw passing through the hole in said side-wall and being threaded into the hole in said second gib.

3. A circularly moving loop-taker for lock-stitch sewing machines comprising a thread-case carrier having a peripheral bearing rib; a cup-shaped body adapted to receive said thread-case carrier; a cylindrical sidewall formed as part of said body, said side-wall being provided on its inner surface with a circular raceway having a base and a side-wall, said side-wall also having a substantially crescent shaped circumferential slot extending radially therethrough and a pair of holes extending parallel to the axis of said hub and opening into said slot; a substantially crescent shaped gib of a size such as to fill the slot in said side-wall, and said gib having a pair of threaded holes; a circular flange formed on the inner edge of said gib and overhanging a portion of said circular raceway thus acting to hold the bearing rib of said thread-case carrier in said raceway; and a pair of threaded screws passing through the holes in said body-wall and being threaded into the holes in said gib.

4, A circularly moving loop-taker for use with lockstitch sewing machines comprising a thread-case carrier and a thread case, said thread-case carrier having a peripheral bearing rib; a cup-shaped body having a loop-seizing beak and being adapted to receive said thread-case carrier; a cylindrical side-wall formed as part of said cup-shaped body, said side-wall being provided on its inner surface with a circular raceway having a base and a side-wall, said side-wall also having a substantially crescent shaped slot located adjacent to said beak and provided with convergent side-walls extending radially from the inside to the outside of said side-wall and said side-wall also having a pair of unthreaded holes extending parallel to the axis of said hub and opening into said slot; a substantially flat crescent shaped gib having convergent ends and of a size such as to fill the slot in said body-wall, and said gib having a pair of threaded holes; a circular flange formed on the inner edge of said gib and overhanging a portion of said circular raceway thus acting to hold the bearing rib of said thread-case carrier in said raceway; and a pair of threaded screws passing through the holes in said side-wall and being threaded into the holes in said gib.

References Cited in the file of this patent UNITED STATES PATENTS 1,048,672 Finch Dec. 31, 1912 2,015,472 Goosman Sept. 24, 1935 2,523,230 Petskeyes Sept. 19, 1950 

